Transformer



J. L. SCHERMERHORN TRANSFORMER Jan. 17, 1928.

Original Filed Nov. 6.

INVENTOR .Ta/m/ 4- 5c HEEMEk/ /M/V' BY a227,?

ATTOR E Reissued J an. 17, 1928.

UNITED STATES PATENT OFFICE.

JOHN L. SCHEBIMERHORN, OF NEWARK, NEW JERSEY, ASSIGNOR TO AMERICANTRANS- I FORMER COMPANY, OF NEWARK, JERSEY.

TRANSFORMER.

Original No. 1,612,947, dated January 4, 1927, Serial No. 67 ,392, filedNovember 6, 1925. Application for reissue filed November 19, 1927.Serial No. 234,540.

This invention relates to transformer and as shown and described hereinis particularly adapted for use in connection with radio circuits. Thegeneral 6 object of my invention is to improve the details entering intothe construction of a transformer, whereby the general efliclency is imroved and the cost of construct on reduce Another object of my inventionis to provide improved means for making connections to the windings ofthe transformer.

The invention will be readily understood in connection ,with thisspecification.

In the drawing Figure 1 is a perspective view of the completetransformer.

Figure 2 is a view of the combined side and end piece of the transformercase, in

extended position.

Fi ure 3 is a fragmentary view of a modified orm showing a method oflocking the terminal connecting rack in position.

: of a further modified form.-

Figure 5 is an end view of thewindings of the transformer, while Figure6 is a longitudinal section through the winding without the core.

Figure 7 shows a further modified form for holding the connecting rackin place.

Figure 8 is a plan view of one end of the casing with the top plate andterminal board removed.

Referring now to the details wherein like numbers refer to correspondingparts in the various views: The transformer comprises;

a primary winding 1, and apair of secondaries 2 and 3 preferably woundin two coils and suitably connected. The opening to receive the centralpart of the core la ations which arepreferably E shaped, but are notshown and described herein except to say that the laminations are builtup around the windings in the usual way, such as disclosed inSohermerhorn et al. Patent 1,579,955, issued April 6, 1926, and then thecasing assembled around the completed unit.

an electrical by reference to the attached drawing, taken Figure 4 is aview similar to Figure 3, but

The casing consists of two similar combined side and end pieces 6, andsimilar top and bottom pieces 7. Piece 6, is made of one piece ofsuitable metal, the side ortion being included between the dotted ines 8and 9 on which. lines the piece 6 is bent to form the end portions 10.The end portion 10, is formed or bent on the lines 11, 12 and 13, toform a channel shaped part 14, which is adapted to engage and securelyhold the ends of the core laminations, lugs 15 are provided on oppositesides of the end portions 10, which are bent out. at right angles to thechannel as shown in Figure '1, each lug 15 is provided with a hole 16,and through these holes are passed eyelets 17 which also go through thetop and bottom 30, of the otherpiece, as is more clearly shown in apartial plan'view shown in Figure 8, it being understood that the-partsare locked in reverse position on the opposite end of the transformercasing. The edge 29 may be positioned or extended to anysatisfactorydistance, even to the point of being over the end surface of thechannel, as shown by the dotted line 32, extending from the edge 31 asillustrated in Figure 8, thereby forming a very secure lock. Each of thepieces 6 have portions cut away at 18, leaving a tongue 19. Mounted inthe cut awa portions or notches 18, and preferably bac of the tongue 19,is a terminal connecting board or strip 20 of some goodstrong insulatingmaterial. Mounted on opposite ends of the terminal board 20, in anysatisfactory manner, as by eyelets 21, are terminals 22, each having afinger 23, bent over and extending through connecting board 20, therebyacting as a dowel to prevent ter-' minals 22 from shifting in theirposition. Furthermore the bent over ends or dowels 23, also serve asmeans for connecting the 'means 0 terminals of the transformer windingsto the terminals 22, it being understood that these connections are madebefore the bottom plate 7, is put in position, and preferably theterminals of the primary winding being connected to the terminals on onestrip and the ends of the secondary winding to the terminals on theconnecting strip on the opposite side of the transformer. If desired thetransformer windin ends may be reinforced and brought through theeyelets 21, and the ends passed through small holes 24, in the terminals22 and soldered thereto. The outside connections are brought to andprefer ably soldered to the ends 25. The terminal strip of connectingboard .20, as shown in Figure 1 is fastened to the tongue 19, by aneyelet 26, oing through the hole 27 in the tongue. The connecting stripmay be securely anchored in position. without the use of the eyelet 26,by means of the arran ments shown in Figures 3, 4, and 7 In igure 3, anotch 28 is provided in the insulating strip 20, and adapted to engage acorrespondin notch in the cover piece 6. As shown in igure 4, the notch28 may be positioned beyond the line 8 of the cover.

In Figure 7 the connecting strip is notched I at both ends to fit behindthe cover.

In addition to the means shown and described for holding the terminalboard 20 to the combined side and end piece 6, it is obvious that otherequivalent means may be employed; but in all cases it is preferable thatthe terminal board close the opening or openings in piece 6, so as tosubstantially seal the casing.

The eyelets 17, are further used for mounting the transformer which canbe set-on either one of the pieces 7 so that the connecting board 20, isheld at the bottom of the transformer or at the top.

Other modifications in details may be made without departing from thespirit of the invention or the scope of the appended claims.

Having thus described my invention, what I claim is:

1. A transformer comprising a core, windings on the core and a casingcompletely enclosing the core and windings, said casing consisting oftwo similar top and bottom pieces, and two similar combined side and endpieces, means'for fastening all of said pieces together, said sidepieces having portions removed beginning at theline where the sides areformed into the ends and extending toward the center of'the side andaterminal connecting board positioned in the openings produced bysaid-removed portions and means cooperating between the terminal boardand the side piece for holding the terminal board in place.

2. A transformer comprising a core, windings or the core and a casingcompletely en closing the core and windings, said casing consisting oftwo similar top and bottom PIECES and two similar comblned s1de and endpieces, means for fastening all of said pieces together, said sidepieces having portions cut out on one edge forming a tongue,

closing the core and windings, said casing consisting of two similar topand bottom pieces, and, two similar combined side and end pieces, meansfor fastening all of said pieces together, said Side pieces havingportions cut out on one edge forming a tongue, said cutout portionsextending from the tongue to a line on which the side piece isformedinto an end and a terminal connecting board positioned in the 'cutout portion of the sides and behind said tongue and extending slightlybeyond said line on which the side pieceis bent and means for fasteningthe terminal board to said tongue.

4. A transformer comprising, a core, windings on the core and a casingcompletely enclosing the core and windings, said casing consisting oftwo similar top and bottom pieces, and twosimilar combined s1de and endpieces, means for fastening all of sald pleces together, said s1depleces having portions cut out on one edge forming a tongue, said outout portions extending from the tongue to a line on which the side pieceis formed into an end and a terminal connectmg board positloned 1n thecut out portlon of the sides and behind said tongue, said ter- 'minalboard having a terminal mounted on said casing consisting of twosimilartop and bottom pieces and two simllar combined side and endpieces, meansfor fastenin all of said piecestogether, said side pieces havingportions cut out on one edge forminga tongue, said out out portionsextending from the tongue to aline on which the side piece is formedinto an end and a terminal'connccting board positioned in the cutoutportion of the sides and behind said tongue,

terminals fastened to each'end of the connecting board by means ofeyelets and a dowel, said eyelets serving if desired as passages forconnecting leads from the terminal to the transformer windings and meanscooperating between the terminal-board and the side piece for holdingthe terminal board in place.

6. A transformer con'iprising a core, windings on the core and a casingcompletely enclosing the core and windings, said casing consisting oftwo similar top and bottom pieces and two similar combined side and endpieces, said side ieces having portions cut out on one ed e orming atongue, said side pieces being formed into ends on a line near theextremity away from the tongue of a cut away portion, said ends havingportions formed in the shape of a channel and having lugs on both sidesand opposite ends of the channel, means cooperating between said lugsand the top and bottom pieces for fastening them to the combined sideand end pieces, a terminal connecting board positioned in said out outportions and means cooperating between the terminal board and the sidepiece for holding the terminal board in place.

7. A transformer comprising a core, windings on the core and a casingcompletely enclosing the core and windings, said casing consisting oftwo similar top and bot-tom pieces and two similar combined side and endpieces, said side ieceshaving portions cut out on one edge forming atongue, said side. pieces being formed into ends on a line near theextremity away from the tongue, of a cut out portion, said ends havingportions formed in the shape of a channel and having lugs on both sidesand opposite ends of the channel, eyelets passing through the lugs andthe top and bottom plates for fastening said casing parts together, saideyelets serving as mounting means for the transformer, a terminalconnecting board having terminals fastened thereto positioned in saidout out portions and means passing through the tongue and connectingboard for holding the latter in place.

8; A transformer comprising a core, windings on the core. and a casingcompletely enclosing the core and windings, said casing consisting oftwo similar top and bottom pieces and two similar combined side and endpieces, said s ide pieces having portions cut out on one edge-forming atongue, said side pieces being formed into ends on a line near theextremity away from the tongue, of a cut out portion, said ends havingportions formed in the shape of a channel and having lugs on both sidesand opposite ends of the channel, said channels engaging the corelaminations to hold them in place, rivet means passing throughthe'lugsand the top and bottom plates for fastening said casing partstogether, a terminal connecting board havin terminals secured theretopositioned in sai cut out portions and means cooperatsaid piecestogether, each of ing between the terminal board and the side piece forholding the terminal board in place.

9. A transformer comprising a. core, windings on the core and a casingcompletely enclosing the core and windings, said casing onsisting of twosimilar top and bottom pieces and two similar combined side and endpieces, means for fastening all of said pieces together, said sidepieces having portions removed to form a tongue, a terminal connectingboard positioned across the openings formed by said removed portions andsubstantially closing said openings, means cooperating between theterminal board and the tongue for holding the terminal board in place,and terminals mounted on each end of the terminal board. 10. Atransformer comprising a. core, windings on the core and a casingcomplct el y enclosing the core and windings, said casing consisting oftwo similar top and bottom pieces and two similar combined side and endpieces, means for fastening all of said side pieces having at least aportion removed, a terminal connecting board positioned across theopening formed by said removed portion and'substantially closing thesame, means cooperating between the side pieee andthe terminal board forholding the latter in place, and terminals associated with the terminalboard.

11. A transformer comprising a core, windings on the core and a casingcomplete- 1y enclosing the ing consisting of two similar top and bottompieces and two similar combined side and end pieces, means for fasteningall of said pieces together, each of said side pieces having at least aportion removed, a terminal connecting board carried by said combinationside pieces and extending across the opening formed by said removedportion and, terminals associated withv the terminal board,

12. A transformer comprising a core, windings on the core, and a casingcompletely enclosing the core and windings, said casing consisting oftop, bottom and two combined side and end pieces, said two combinationpieces at least being similar, means'for fastening all of said piecestogether, each of said side pieces having at least a portion removed, atleast one terminal connecting board carried by at least one of said sidepieces and extending across the opening formed by said removed portionand terminals mounted on the terminal board.

13. A transformer comprising a core, windings on the core, and a casingcomplete- 1y enclosing the core and windings, said casing consisting oftop, bottom and two combined side and end ieces, said two combinationpieces at least eing similar, means for core and windings, said caslit)pieces and two similar combined side and end pieces, means for fasteningall of said pieces together, at least one terminal connecting boardcarried by at least one of said combination pieces and terminalsassociated with the terminal board.

In testimony whereof, I affix my signature.

JOHN L. SCHERMEll IURN.

